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Green rectangular circuit board with black memory chips and gold edge connectors

A-Tech

A-Tech 16GB DDR4 2666MHz ECC RDIMM 2Rx8 Server Memory

SKU CH-HEED-7XS5D

16 GB DDR4 2666 MHz ECC registered DIMM for server and workstation upgrades

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • 16GB ECC RDIMM adds reliable server capacity
  • DDR4 2666MHz PC4-21300 speed matches system specs
  • CL19 CAS latency at 1.20V standard voltage
  • 2Rx8 registered dual-rank organisation for stability
  • 288-pin DIMM form factor fits server slots

16GB DDR4 ECC RDIMM for servers

This 16GB DDR4 2666MHz module is built for servers and workstations that require registered ECC memory. It operates at 1.2V with CL19 latency and uses a 2Rx8 organisation. The 288-pin DIMM fits standard DDR4 RDIMM slots in compatible platforms.

Fits registered DDR4 channels

The stick plugs directly into a DDR4 RDIMM slot on a motherboard that supports registered ECC memory. No extra cables or brackets are needed. Using registered modules reduces electrical load on the memory controller, freeing headroom for larger total capacities across multiple slots.

Replaces specific Samsung parts

The module is a compatible equivalent for Samsung M393A2K43BB1-CTD, M393A2K43CB2-CTD and M393A2K43DB2-CTD. It uses major-brand chips and undergoes quality-assurance testing before shipment. Buyers who need unbuffered UDIMMs or non-ECC memory should look elsewhere.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $115.99
Cheaper than about 63% of the 6,523 comparable items (median $188.99).
Total capacity 16 GB
Lower than about 60% of the 6,064 comparable items (median 32 GB).
Price per GB $7.25 per GB
Typical for this category: the median of 6,064 items is $7.25 per GB.

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameA-Tech
Total capacity16 GB
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank2Rx8
Power
Rated voltage1.2 V

Questions about this item

Will the 2666 MHz DDR4 speed limit throughput when the server runs at full load continuously?

The module runs at 2666 MHz with CL19 latency, so sustained bandwidth is capped at the PC4-21300 rate.

How much heat and power does the 1.2 V registered ECC DIMM add during all-day operation?

At 1.2 V the 16 GB RDIMM draws standard DDR4 power and produces typical registered-module heat; no extra cooling is required.

Does my motherboard need 288-pin DDR4 slots that support ECC registered memory for this 2Rx8 module to work?

Yes — the 288-pin DDR4 RDIMM requires a server or workstation board with registered ECC support.

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